Improved CP error handling and audit log

cp/app/Middleware/AuditMiddleware.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Middleware;
+
+use Psr\Http\Message\ServerRequestInterface as Request;
+use Psr\Http\Server\RequestHandlerInterface as RequestHandler;
+use Pinga\Session;
+
+class AuditMiddleware extends Middleware
+{
+
+    public function __invoke(Request $request, RequestHandler $handler)
+    {
+        if (isset($_SESSION['auth_user_id'])) {
+            $userId = (int)$_SESSION['auth_user_id'];
+            $this->container->get('db')->exec("SET @audit_usr_id = $userId");
+            $this->container->get('db')->exec("SET @audit_ses_id = " . crc32(\Pinga\Session\Session::id()));
+        }
+        return $handler->handle($request);
+    }
+
+}